Malicious PDF — malware analysis report

Static analysis result for SHA-256 b307ee16fa4d22d9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 08:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f12e29f0edae0bac26b252259294855 SHA-1: f7c641f4d6e9ad50a563f220bedff031d5c5be63 SHA-256: b307ee16fa4d22d9d4d8470522335a2aab3e2bc686d076799a78d0311a094544
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to external resources, many hosted on compromised CMS uploads and disposable domains, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of a 'download button' heuristic suggests a deceptive call to action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=9th+class+previous+year+question+papers+maths PDF link annotation
    • https://masterjobintl.com/ckfinder/userfiles/files/80270179707.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/23045553474.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/47946877312.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358139bc11d---38097953909.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/57950624576.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/sixiduzevemaziratiguloge.pdfIn PDF document text
    • https://ocw.tw/uploads/files/91588740694.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/uhjp136uhmviaiq8gunsbodk7c/fajilo.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/51250834834.pdfIn PDF document text
    • https://denimder.org/resimler/files/gujurob.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/10/rotuseleduwa.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/naxed.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/38983674361.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/11987749928.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/favemufivuxugediji.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/31435172416.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/tibadu.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/5806209803.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356e3178fbe---kotaselifoxirazavexobi.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/65218016749.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/84265324855.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/98840970811.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133425445193---nejufo.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/17305441179.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/petitawowebafurutuditamex.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/farumifiwik.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 18176 bytes
SHA-256: 907be8447fdca15c751bd1e3f810ba5394104d72e1294d6b32185a97c9630b6e
font_01_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 11136 bytes
SHA-256: 4fdd565e9d6e92afededaa12419a7fb9b897a9cea3b45eac2abaa5df0fb02ada
font_02_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.